JP4759361B2 - End seal device - Google Patents

Description

  The present invention relates to an end seal device.

  In automatic packaging machines, bag making devices, etc., an end seal device is arranged on the carry-out side, the film formed in a cylindrical shape is sealed and cut in the direction crossing the traveling direction, and individual packages (empty bags) Body).

  One type of end seal device is a rotary end seal device. In this type, as shown in FIG. 1, end sealers 3 are attached to rotating shafts 2 that are opposed to each other above and below a film 1 that is conveyed. At this time, the peripheral surfaces meshing with each other at the tips of the end sealer 3 become the seal surface 3a, and the seal surfaces 3a of the end sealers 3 arranged above and below are in contact with each other so as to sandwich the film 1. And since the heater is incorporated in the end sealer 3, the film 1 is heated and melted by sandwiching the film 1, thereby being heat-sealed and sealed.

  Further, a cutter blade 4 or a receiving blade 5 is built in the opposing surfaces of both end sealers 3, and the film 1 is simultaneously cut in the lateral direction by sandwiching the film 1 with the cutter blade 4 and the receiving blade 5. It has become.

  As shown in FIG. 2, the cutter blade 4 (receiving blade 5) is inserted into a groove 3b formed in the center of the end sealer 3 so as to extend in the axial direction. In that state, the screw 7 is used to fix and fix. That is, the seal surface 3a side of the end sealer 3 is separated into two blocks 3c and 3d by the groove 3b. The first block 3c is provided with a screw hole 3e penetrating in the transport direction. And if the cutter blade 4 (receiving blade 5) is inserted in the groove part 3b, the cutter blade 4 (receiving blade 5) will be arrange | positioned between the 1st, 2nd blocks 3c and 3d. In this state, the screw 7 is inserted into the screw hole 3e and the screw 7 is tightened. Then, the tip of the screw 7 comes into contact with the cutter blade 4 (receiving blade 5) and is fixed by being sandwiched with a predetermined pressure with the second block 3d. It should be noted that the prior art illustrated up to the fixing structure of the cutter blade 4 and the receiving blade 5 was not found, but as this type of rotary end seal device, for example, Patent Documents 1, 2, and 3 are disclosed. is there.

JP 2000-85723 A JP 2000-177715 A Japanese Patent Laid-Open No. 10-316114

  For example, as shown in Patent Documents 2 and 3, the improvement and invention of the conventional end seal device is centered on the improvement of the sealing surface, and it is apparent that it is performed on the fixing structure of the cutter blade 4 and the receiving blade 5. I can't. And if it takes the structure fixed between the screw 7 and the 2nd block 3d using the fastening force of the screw 7 like the past, the problem shown below will arise.

  That is, the cutter blade 4 and the like are fixed by a plurality of screws 7. The force for fixing is a force that the screw 7 presses against the second block 3d, and the force from the second block 3d that counters the force is from the second block 3d. Reaction force. Accordingly, as the tightening force of the screw 7 is increased, the cutter blade 4 and the like are more securely fixed, but the force generated in the direction in which the first block 3c and the second block 3d are separated from each other (the direction in which the groove portion 3b spreads) increases. Become. Further, since the end sealer 3 is heated by the heater during operation, the end sealer 3 undergoes thermal expansion.

  Together, these factors cause the groove 3b to expand. At this time, one or both of the first block 3c and the second block 3d may be displaced as shown in FIGS. 3 (a) to 3 (c) due to the expansion of the groove 3b. It is uncertain. Since the cutter blade 4 and the like are in surface contact with the second block 3d, when the second block 3d side is displaced as shown in FIGS. 3B and 3C, the cutter blade 4 and the like are shown in FIG. Is inclined, and when the cutter blade 4 and the receiving blade 5 are engaged with each other, the cutter blade 4 and the receiving blade 5 are not arranged in a straight line when viewed in the vertical direction, but they are in contact with each other, resulting in cut defects and the like. Not only is there fear, but the target film position cannot be cut.

  Further, if only the first block 3c is displaced as shown in FIG. 3A, the cutter blade 4 and the like are not inclined, but the separation distance from the first block 3c becomes long and becomes unstable.

  Furthermore, as a deformation pattern of the first block 3c and the second block 3d, in addition to the above, for example, when viewed in a direction (axial direction) orthogonal to the rotation direction of the end sealer 3, as shown in FIG. In addition, the blocks deformed at both ends may be different. That is, the first block 3c is displaced at one end, and the second block 3d is displaced at the other end. Then, the groove 3b is not parallel to the direction (axial direction) orthogonal to the rotational direction, but is inclined and may be further curved. In such a case, the cutter blade 4 and the like are also deformed / displaced in a shape along the inner surface of the second block 3d of the groove 3b, so that the direction orthogonal to the rotation direction, that is, the direction orthogonal to the conveyance direction of the film 1 is used. Therefore, the target film position cannot be cut. In addition, since the displacements of the upper and lower end sealers 3 are independently generated, the inclination angles of the cutter blade 4 and the receiving blade 5 are often different, and there is a possibility of causing a cut defect. In particular, in the case of inclining in the opposite direction, the risk increases.

  Furthermore, in any of the cases described above, the cutter blade 4 and the receiving blade 5 do not come into contact with each other in a correct state.

  The present invention has been made in view of the above-described background. The object of the present invention is that a groove portion for inserting a cutter blade or the like provided in an end sealer does not expand or deform, and is desired. An object of the present invention is to provide an end seal device that can cut the position with certainty, has good durability, and can be used for a long time.

In order to achieve the above object, an end seal device according to the present invention includes a pair of rotating shafts and an end sealer connected to each of the pair of rotating shafts. In the central portion of the seal surface, a laterally transverse groove portion is provided, and the end portion of the end sealer is formed by the groove portion so as to be separated into the first block and the second block, and in the groove portion, A cutter blade or a receiving blade is inserted, a set screw is inserted from at least one of the first block and the second block, and the tip of the set screw is brought into contact with the cutter blade or the receiving blade and pressed against the opposite block. Thus, the cutter blade or the receiving blade is fixed, and the first block and the second block are fastening portions such as screws and bolts. Linked by, a position facing to the fastening member before Symbol cutter blades or receiving blade, the through-holes or notches are formed, and insertably constituting the fastening member.

  According to this invention, since the 1st block and the 2nd block are connected with the fastening member, it is suppressed that a block displaces in the direction which a groove part spreads. As a result, the cutter blade or the receiving blade is maintained in a state where it is firmly fixed in the groove portion by the set screw, and is maintained in a straight line when engaged. Therefore, the cutting of the cutter is improved and the durability is also improved.

  In the present invention, the groove for inserting a cutter blade or the like provided on the end sealer does not expand or deform, and the desired position can be cut reliably, and the durability is good and long-term. Can be used.

  FIG. 6 shows an embodiment of a pillow packaging machine to which the present invention is applied. The pillow wrapping machine 10 is arranged with a to-be-packaged article conveyance supply device 11, a wrapping machine body 12, and a carry-out conveyor device 13 in order from the upstream side.

  The packaged article transport and supply device 11 is configured by a finger conveyor device to convey the packaged article 14 at regular intervals and sequentially supply the packaged article 14 to the packaging machine body 12 at the next stage. That is, the push finger 17 is attached to the endless chain 16 spanned between the front and rear sprockets 15 and 15 at regular intervals. Then, by supplying the article to be packaged 14 between the front and rear push fingers 17, the article to be packaged 14 is conveyed at the finger pitch of the push fingers 17.

  The packaging machine main body 12 is configured to guide the belt-like film 21 continuously drawn from the raw fabric roll 20 to the bag making device 24 while passing over various rollers 22, and the belt-like film 21 is transferred to the bag making device 24. By making it pass, a bag is formed into a cylindrical shape. In addition, the unloading end of the above-described packaged article transport and supply device 11 is located in the bag making device 24, whereby the packaged article 14 unloaded from the packaged article transport and supply device 11 at predetermined intervals is It is supplied at predetermined intervals into a bag making machine 24 and then into a tubular film 25 which is formed into a tubular shape.

  On the downstream side of the bag making device 24, a conveyance path for the tubular film 25 that encloses the article to be packaged 14 is configured, and a center seal device 27 is disposed at a predetermined position below the conveyance path, and further in the forward direction of the traveling direction. The end seal device 30 is arranged in the front. The center seal device 27 seals a portion where the side edges of the belt-like film 21 are overlapped, that is, the film polymerization end of the tubular film 25.

  The end seal device 30 is configured by attaching end sealers 32 and 32 ′ to rotary shafts 31 and 31 ′ arranged vertically, and the pair of end sealers 32 and 32 ′ are rotated in synchronization to form a cylindrical shape. A predetermined portion of the film 25 is sandwiched from above and below, and is sealed and cut. As a result, a predetermined position of the tubular film 25 (portion where the article to be packaged 14 does not exist) is correctly sealed and cut by the end seal device 30, and the leading end portion of the tubular film 25 (part including the leading article 14 to be packaged) ) Are separated, and the package 29 is manufactured. Then, the package 29 is conveyed on the carry-out conveyor device 13.

  Next, a preferred embodiment of the end seal device according to the present invention will be described. As described above, the rotary end seal device 30 is installed at a predetermined position on the downstream side of the pillow packaging machine, and seals and cuts a predetermined position of the tubular film 25. As shown in FIGS. 7 and 8, a pair of upper and lower rotary shafts 31, 31 ′ is connected to a gear 34 at one end, and the gears 34 are engaged with each other. As a result, the pair of rotating shafts 31 and 31 ′ are rotated in synchronization with each other, and the end sealers 32 and 32 ′ come into contact with each other and sandwich the tubular film 25. Although not shown, one gear 34 is linked to a drive motor via a power transmission mechanism and is driven to rotate at a predetermined timing.

  The pair of end sealers 32 and 32 'are formed with arcuate seal surfaces 32a and 32a' at their tips, and the central portions of the seal surfaces 32a and 32a 'are laterally transverse grooves 32b and 32b'. Is formed. The cutter blade 35 is mounted in the groove portion 32b of the upper end sealer 32, and the receiving blade 36 is mounted in the groove portion 32b 'of the lower end sealer 32'.

  By providing the grooves 32b and 32b ', the seal surface 32a side of the end sealer 32 is separated into the first blocks 32c and 32c' and the second blocks 32d and 32d '. The front side in the film transport direction is the first blocks 32c and 32c, and the rear side in the film transport direction is the second blocks 32d and 32d '.

  In this embodiment, as shown in FIGS. 9 and 10, a plurality of first screw holes 40 penetrating in the film transport direction are provided in the first blocks 32c and 32c ′ (4 in this example) as in the conventional case. And a set screw 41 is attached to the first screw hole 40. The tip of the set screw 41 comes into contact with the cutter blade 35 and the receiving blade 36 and is pressed against the second blocks 32d and 32d 'with a predetermined force to fix the cutter blade 35 and the receiving blade 36.

  Here, in the present invention, the first blocks 32c and 32c ′ and the second blocks 32d and 32d ′ are provided with a plurality of (two in this example) second screw holes 42 positioned in a straight line, and the second screw holes. A connecting bolt 43 is attached to 42. In the present embodiment, the connecting bolt 43 is inserted from the first block 32c, 32c 'side, and the leading end side of the connecting bolt 43 is fitted into the second screw hole 42 provided in the second block 32d, 32d'. As a result, the first block 32c, 32c ′ and the second block 32d, 32d ′ are connected by the connecting bolt 43, and the groove portions 32b, 32b ′ are prevented from expanding.

  Further, a through hole 45 is provided in a portion of the cutter blade 35 and the receiving blade 36 facing the connecting bolt 43. Thereby, the connection bolt 43 can connect both blocks by penetrating the inside of the through hole 45. In the present embodiment, the through hole 45 is used, but it may be a notch. The point is that the cutter blade 35 or the like does not exist at a portion facing the connecting bolt 43, and the connecting bolt 43 can pass therethrough.

  According to the present embodiment, since the groove 32b does not expand, the first blocks 32c and 32c ′ and the second blocks 32d and 32d ′ are not displaced. As a result, the cutter blade 35 and the receiving blade 36 can be positioned on a straight line when meshed with each other, and the tubular film can be reliably cut at a desired position. Further, since the block is prevented from being displaced in the direction in which the groove portion expands, the relative positional relationship between the seal surfaces 32a and 32a ′ is not shifted, and a seal failure does not occur.

  In the present embodiment, the second screw holes 42 provided in the first blocks 32c and 32c and the second blocks 32d and 32d ′ are both formed so as to penetrate each block. There is no limitation, and the block (in the present embodiment, the second blocks 32d and 32d ′) side of the connecting bolt 43 does not necessarily have to penetrate. Furthermore, in the present embodiment, the set screw 41 and the connecting bolt 43 are both inserted from the first blocks 32c and 32c ′, but the present invention does not necessarily have to be inserted from the same block. Each insertion block may be different.

  In the present embodiment, the second screw holes 42 are provided in the first blocks 32c and 32'c and the second blocks 32d and 32d ', respectively. However, the block on the side where the connecting bolt 43 is inserted (this embodiment Then, the first blocks 32c and 32c) may be through-holes (inner diameter that is one size larger without a female screw), and may be fastened only to the opposite block.

It is a figure which shows a prior art example. It is a figure which shows a prior art example. It is a figure which shows the problem of a prior art example. It is a figure which shows the problem of a prior art example. It is a figure which shows the problem of a prior art example. It is a figure which shows one form of the pillow packaging machine which is an example of the packaging machine with which the end seal apparatus of this invention is applied. It is a perspective view showing one embodiment of an end seal device. It is a side view showing one embodiment of an end seal device. (A) is a front view, (b) is a plan view. (A) is a sectional view taken along the line aa in FIG. 9, and (b) is a sectional view taken along the line bb in FIG.

Explanation of symbols

30 End seal device 31, 31 'Rotating shaft 32, 32' End sealer 32a, 32a 'Seal surface 32b, 32b' Groove 32c, 32c 'First block 32d, 32d Second block 34 Gear 35 Cutter blade 36 Receiving blade 40 First 1 screw hole 41 set screw 42 2nd screw hole 43 connecting bolt

Claims (1)

In an end seal device including a pair of rotating shafts and an end sealer connected to the pair of rotating shafts,
In the central portion of the seal surface at the tip of the end sealer, a laterally transverse groove is provided, and the tip of the end sealer is formed to be separated into a first block and a second block by the groove,
A cutter blade or a receiving blade is inserted into the groove,
By inserting a set screw from at least one of the first block and the second block, bringing the tip of the set screw into contact with the cutter blade or the receiving blade and pressing it against the opposite block, the cutter blade or the receiving blade is Fixed,
The first block and the second block are connected by a fastening member such as a screw or a bolt, and a portion facing the fastening member of the cutter blade or the receiving blade is formed with a through hole or a notch, and the fastening An end seal device configured to be capable of inserting a member .

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